This picturesque monastery at the base of a cliff is a peaceful oasis open to all visitors.

This sign marks the entrance to a tiny proto-state within the small country of Moldova.

Seventy-five miles of limestone caves host more than a million bottles of wine beneath a sleepy Moldovan town.

The largest wine cellar in the world is a 150-mile network of underground caves near the capital of Moldova.

A museum dedicated to secret surveillance.

Explore a traditional Albanian dwelling that pays tribute to the region's rich history.

Bronzes and busts that once stood in the city's main squares are now relegated to a small hidden courtyard.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

A naturally beautiful, seemingly bottomless deep blue spring.

Depending on the region's rainfall, this church may be partially submerged.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

This 3,800-year-old site contains markers used to study the movement of the sun and moon and create a lunar calendar.

The ceiling of this cavern is dripping with multicolored marble stalactites.

Christianity and Islam have clashed, yet here a Serbian Orthodox church and a mosque stand together.

The only known mosaic depicting the Greek god of sleep, Hypnos.

A beautiful mountaintop mausoleum devoted to a Montenegrin icon can't seem to make everyone happy.

Its frescoes depict the likeness of Marshal Tito, Karl Marx, and Friedrich Engels burning in hell.

This virtually windowless mass of smooth concrete is the only Catholic church in the city.

A curious cave church carved into the face of a cliff.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Two bulls enter. One leaves a champion—but neither loses its life.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.